(1)Install batteries (Duracell, Energizer or intended brand) for fitting check without difficulty and bad contact.(2)According to EN50088, reverse the battery and ensure battery does not contact with any portion of positive contact plate.

Fail for:(1) The battery was hard to fit the compartment.

(2) Reverse the battery and it can contact the plate.

Battery charge and discharge test

Battery could be charged, and can meet claimed playing time after fully charged.Battery could be discharge.